arm-cci: Split the code for PMU vs driver support

This patch separates the PMU driver code from the low level
CCI driver code and enables the PMU driver for ARM64.

Introduces config options for both.

 ARM_CCI400_PORT_CTRL	- controls the low level driver code for
			  CCI400 ports.
 ARM_CCI400_PMU		- controls the PMU driver code
 ARM_CCI400_COMMON	- Common defintions for CCI400

This patch also changes:
 ARM_CCI - common code for probing the CCI devices. This can be
   used for adding support for newer CCI versions(e.g, CCI-500).

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Abhilash Kesavan <a.kesavan@samsung.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

5 files changed, 53 insertions, 12 deletions

diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 603820e5aba7..81064cd61a0a 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -123,7 +123,7 @@ config SOC_EXYNOS5800
 config EXYNOS5420_MCPM
         bool "Exynos5420 Multi-Cluster PM support"
         depends on MCPM && SOC_EXYNOS5420
-        select ARM_CCI
+        select ARM_CCI400_PORT_CTRL
         select ARM_CPU_SUSPEND
         help
           This is needed to provide CPU and cluster power management
diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
index 3c2509b4b694..daa7ab6cb909 100644
--- a/arch/arm/mach-vexpress/Kconfig
+++ b/arch/arm/mach-vexpress/Kconfig
@@ -53,7 +53,7 @@ config ARCH_VEXPRESS_CORTEX_A5_A9_ERRATA
 config ARCH_VEXPRESS_DCSCB
         bool "Dual Cluster System Control Block (DCSCB) support"
         depends on MCPM
-        select ARM_CCI
+        select ARM_CCI400_PORT_CTRL
         help
           Support for the Dual Cluster System Configuration Block (DCSCB).
           This is needed to provide CPU and cluster power management
@@ -71,7 +71,7 @@ config ARCH_VEXPRESS_SPC
 config ARCH_VEXPRESS_TC2_PM
         bool "Versatile Express TC2 power management"
         depends on MCPM
-        select ARM_CCI
+        select ARM_CCI400_PORT_CTRL
         select ARCH_VEXPRESS_SPC
         select ARM_CPU_SUSPEND
         help
diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
index b99729e36860..79e297b1f221 100644
--- a/drivers/bus/Kconfig
+++ b/drivers/bus/Kconfig
@@ -43,12 +43,32 @@ config OMAP_INTERCONNECT
         help
           Driver to enable OMAP interconnect error handling driver.
 
-config ARM_CCI
-        bool "ARM CCI driver support"
+config ARM_CCI400_PORT_CTRL
+        bool
         depends on ARM && OF && CPU_V7
+        select ARM_CCI400_COMMON
+        help
+          Low level power management driver for CCI400 cache coherent
+          interconnect for ARM platforms.
+
+config ARM_CCI400_PMU
+        bool "ARM CCI400 PMU support"
+        default y
+        depends on ARM || ARM64
+        depends on HW_PERF_EVENTS
+        select ARM_CCI400_COMMON
         help
-          Driver supporting the CCI cache coherent interconnect for ARM
-          platforms.
+          Support for PMU events monitoring on the ARM CCI cache coherent
+          interconnect.
+
+          If unsure, say Y
+
+config ARM_CCI400_COMMON
+        bool
+        select ARM_CCI
+
+config ARM_CCI
+        bool
 
 config ARM_CCN
         bool "ARM CCN driver support"
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
index a23663c7a306..054df84562c2 100644
--- a/drivers/bus/arm-cci.c
+++ b/drivers/bus/arm-cci.c
@@ -32,6 +32,7 @@
 static void __iomem *cci_ctrl_base;
 static unsigned long cci_ctrl_phys;
 
+#ifdef CONFIG_ARM_CCI400_PORT_CTRL
 struct cci_nb_ports {
         unsigned int nb_ace;
         unsigned int nb_ace_lite;
@@ -42,12 +43,19 @@ static const struct cci_nb_ports cci400_ports = {
         .nb_ace_lite = 3
 };
 
+#define CCI400_PORTS_DATA       (&cci400_ports)
+#else
+#define CCI400_PORTS_DATA       (NULL)
+#endif
+
 static const struct of_device_id arm_cci_matches[] = {
-        {.compatible = "arm,cci-400", .data = &cci400_ports },
+#ifdef CONFIG_ARM_CCI400_COMMON
+        {.compatible = "arm,cci-400", .data = CCI400_PORTS_DATA },
+#endif
         {},
 };
 
-#ifdef CONFIG_HW_PERF_EVENTS
+#ifdef CONFIG_ARM_CCI400_PMU
 
 #define DRIVER_NAME             "CCI-400"
 #define DRIVER_NAME_PMU         DRIVER_NAME " PMU"
@@ -1022,14 +1030,16 @@ static int __init cci_platform_init(void)
         return platform_driver_register(&cci_platform_driver);
 }
 
-#else /* !CONFIG_HW_PERF_EVENTS */
+#else /* !CONFIG_ARM_CCI400_PMU */
 
 static int __init cci_platform_init(void)
 {
         return 0;
 }
 
-#endif /* CONFIG_HW_PERF_EVENTS */
+#endif /* CONFIG_ARM_CCI400_PMU */
+
+#ifdef CONFIG_ARM_CCI400_PORT_CTRL
 
 #define CCI_PORT_CTRL           0x0
 #define CCI_CTRL_STATUS         0xc
@@ -1460,6 +1470,12 @@ static int cci_probe_ports(struct device_node *np)
 
         return 0;
 }
+#else /* !CONFIG_ARM_CCI400_PORT_CTRL */
+static inline int cci_probe_ports(struct device_node *np)
+{
+        return 0;
+}
+#endif /* CONFIG_ARM_CCI400_PORT_CTRL */
 
 static int cci_probe(void)
 {
diff --git a/include/linux/arm-cci.h b/include/linux/arm-cci.h
index aede5c765eec..521ec1f2e6bc 100644
--- a/include/linux/arm-cci.h
+++ b/include/linux/arm-cci.h
@@ -30,12 +30,16 @@ struct device_node;
 
 #ifdef CONFIG_ARM_CCI
 extern bool cci_probed(void);
+#else
+static inline bool cci_probed(void) { return false; }
+#endif
+
+#ifdef CONFIG_ARM_CCI400_PORT_CTRL
 extern int cci_ace_get_port(struct device_node *dn);
 extern int cci_disable_port_by_cpu(u64 mpidr);
 extern int __cci_control_port_by_device(struct device_node *dn, bool enable);
 extern int __cci_control_port_by_index(u32 port, bool enable);
 #else
-static inline bool cci_probed(void) { return false; }
 static inline int cci_ace_get_port(struct device_node *dn)
 {
         return -ENODEV;
@@ -51,6 +55,7 @@ static inline int __cci_control_port_by_index(u32 port, bool enable)
         return -ENODEV;
 }
 #endif
+
 #define cci_disable_port_by_device(dev) \
         __cci_control_port_by_device(dev, false)
 #define cci_enable_port_by_device(dev) \